fix(docker): copy all workspace package.json manifests before pnpm install

Dockerfile.dev only copied fn-app and fn-runtime package.json before
`pnpm install --frozen-lockfile`. After PR #41 added fn-types,
fn-generator, fn-client, and fn-cli to packages/, those four workspaces
were absent at install time, so pnpm never created their
node_modules/@constructive-io symlinks. The later `pnpm build` then
failed inside the Docker image with TS2307 when fn-generator tried to
resolve `@constructive-io/fn-types`, breaking the CI Test K8s workflow
on main.

Verified locally: `docker build -f Dockerfile.dev .` now completes end
to end and packages/fn-generator/node_modules/@constructive-io/fn-types
resolves to the workspace package.

Author: Anmol1696

Dockerfile.dev

@@ -12,6 +12,10 @@ COPY templates/ templates/
 # Copy all package/job manifests for caching
 COPY packages/fn-app/package.json packages/fn-app/
 COPY packages/fn-runtime/package.json packages/fn-runtime/
+COPY packages/fn-types/package.json packages/fn-types/
+COPY packages/fn-generator/package.json packages/fn-generator/
+COPY packages/fn-client/package.json packages/fn-client/
+COPY packages/fn-cli/package.json packages/fn-cli/
 COPY job/server/package.json job/server/
 COPY job/worker/package.json job/worker/
 COPY job/service/package.json job/service/